Meaning

noun the boundary line or the area immediately inside the boundary

noun an amount beyond the minimum necessary

noun the amount of collateral a customer deposits with a broker when borrowing from the broker to buy securities

originFrom Middle English margyn, from Latin marginem (possibly via Old French margin), accusative of margō (“edge, brink, border, margin”). Doublet of marge and margo.

Etymology from Wiktionary, CC BY-SA 3.0